package com.mva.User_DAO;

import java.util.ArrayList;

public interface UserIO
  {
   // User reader methods
   boolean existsUser (String usr);
   User    getUser    (String User);
   boolean getUsers   (ArrayList<User> users);
   
   // User writer methods
   boolean addUser    (User u);
   boolean updateUser (User u);
   boolean deleteUser (User u);
  }